Youporn extractor "no video formats found"

[gtTracy]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.05.16
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

** Note that there is a closed issue with this problem, but the issue was closed because a commit (in January, if I am reading this correctly) resolved the issue for the original reporter. See issue:
#27822

Verbose log

$ youtube-dl -U
youtube-dl is up-to-date (2021.05.16)
$ youtube-dl --config-location ~/.config/youtube-dl/config.sex --verbose https://www.youporn.com/watch/10973077/mkiu-satsuki-shows-off-in-her-sexy-lingerie/
[debug] System config: []
[debug] User config: []
[debug] Custom config: [u'-o', u'/media/tracy/Testing/DL/sex/%(title)s.%(ext)s', u'--netrc', u'--sleep-interval', u'0', u'--max-sleep-interval', u'5', u'--no-overwrites', u'--download-archive', u'~/.config/youtube-dl/archive-list', u'--yes-playlist', u'--mark-watched', u'--ignore-errors']
[debug] Command-line args: [u'--config-location', u'/home/tracy/.config/youtube-dl/config.sex', u'--verbose', u'https://www.youporn.com/watch/10973077/mkiu-satsuki-shows-off-in-her-sexy-lingerie/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.05.16
[debug] Python version 2.7.18 (CPython) - Linux-5.8.0-53-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[YouPorn] mkiu-satsuki-shows-off-in-her-sexy-lingerie: Downloading webpage
ERROR: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youporn.py", line 148, in _real_extract
    self._sort_formats(formats)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1374, in _sort_formats
    raise ExtractorError('No video formats found')
ExtractorError: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

This problem seems to be a duplicate of a previously closed bug (see referenced URL above). However, this is occurring with a later build than the one that was provided to close the previous bug - either the bug was reintroduced, or something on the site has changed.

This appears to be occurring on all URLs for the site (I tested an arbitrary list of 110 URLs, all reported the same problem). A sample URL is provided here:

https://www.youporn.com/watch/10973077/mkiu-satsuki-shows-off-in-her-sexy-lingerie/

I have verified that the URL provided plays properly in Chrome Version 91.0.4472.77 (Official Build) (64-bit), running on Ubuntu 20.04 with all current updates.